Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca798f1a68cb22cd…

MALICIOUS

PDF

68.6 KB Created: 2021-09-07 19:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f11bd0bcd300b575eced6aa124dee37 SHA-1: fd46af755fbab730e285fa7f1a685b1b30d50a83 SHA-256: ca798f1a68cb22cdbaf126096211bc27186cf8f5c0cfb619722835ec9216681f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The heuristics indicate it's an image-only lure designed to trick users into clicking embedded links. Several of these links point to compromised CMS upload directories, suggesting a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098361a94621---67239627331.pdf In PDF document text
    • https://acronimocostanzo.com/userfiles/file/fuxixufipemabivise.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/nekijufikipuxamozig.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/72701658927.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/muzoxolisexi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf3240ed5---44380660783.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/sorafuzanarofawigowu.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/gabud.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/10452048777.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/bd3babb6dc7ab97dfbddbbe403d9e72f/70014015176.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2c1c161ae---20084535254.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/59893166961.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/37075214193.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/rarijubumutavabujugugi.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/43293078317.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160899931f41cf---nedepuwunekaritom.pdfIn PDF document text
    • http://jucal.es/images/file/40775487503.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/vavoxawiwogalox.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/56418177581.pdfIn PDF document text
    • https://ntc-container.com/upload/files/64484614268.pdfIn PDF document text
    • http://agro-partner.com/Image/files/lejiduragizoginif.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc39e2c0e---wapexewobimugon.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/buliwinula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=20698+installing+and+configuring+windows+10+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5C 11588 bytes
SHA-256: e114a778390466aadec75a4cafbe99e5b4ffa729bd423024f74bc62ecaa2498a
font_01_sfnt_off0000cad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD4 13808 bytes
SHA-256: c1761f5c7cda7ba8048fa29d1e56a220b1a6a5f799af10b7c816f4e5d9c8c83b
font_02_sfnt_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1